100,000 BTU/h Schwank Propane Gas Infared Heater, suspended from ceiling. 11"W.C gas pressure.
I set the t-stat to make the circuit everything runs as it should up until about 5 minutes into operation. Seems like the gas builds up literally explodes and repeats this sequence until the flame sensor cools off enough to shut the gas valve. Unit will retry 4 times before it locks out.
Gas pressures are as they should be
Ceramic tiles are properly installed, sealed, cleaned recently
Ignition module has been replaced(dosent matter because unit lights properly)
gas valve has been replaced once before.
installed in a relatively clean atmosphere.
the whole building has the exact same heaters and only 2 have thsi problem..i believe i have covered every avenue and can't seem to diagnose the problem. I am pointing towards a manufacturers defect in sizing???